Twelve students in a class average 70% on a certain test. eighteen others average 80%. what is the overall average of the thirty students as a percent

idk what the answer is but for the points

step-by-step explanation:

the first one and the second one that's the answer

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints